\begin{acknowledgements}
  \doublespacing
  I'd like to express my gratitude to my supervisors Dr Damon Berry and Dr Jesus Bisbal for their
  tremendous help and support. 
  
  I was most inspired by Damon's enthusiasm in 
  research, whose creativity and determination guided me through my work. As my second supervisor Jesus offered me many valuable advice, suggestions and guidance.

  I'd also like to thank all the wonderful and ever so helpful colleagues: Mark Nolan, Fabrice Camous, Brian Madden, Jack Keegan, James
  Condron, Xu Chen, Syed Haider, Ruud van Stiphout and Francesca Buffa. 
  
  I thank my wonderful parents, who give me strength and encouragement. And a
  special someone who offered me great help and support.

\end{acknowledgements}
